The goal of this K02 proposal is to allow the applicant to devote 75% of his time during the next five years to exploring the structural basis of dilated cardiomyopathy. In particular, the PI will focus on the elucidation of the functional interactions between phospholamban (PLB) and sarco(endo) plasmic Ca-ATPase (SERCA), and PLB and protein Kinase A (PKA). The functional interactions of PLB with both SERCA and PKA are pivotal for maintaining calcium homeostasis in muscle, and their characterization may lead to novel therapeutic strategies including the introduction of new drugs and improve gene therapy. Time-off from teaching and service would allow the applicant to develop new strategies for the elucidation of these protein-protein interactions and to travel to the NIH-funded National High Magnetic Field Laboratory in Florida. New approaches are needed because the complexes to be characterized involve membrane proteins, which have proven notoriously recalcitrant to the classical methods of structural biology. The PI group has obtained new and promising results towards the characterization of these protein-protein interactions, but new spectroscopic techniques are needed to refine these results. These techniques will include 1) new solution NMR approaches using detergent micelles to study functional complexes, 2) new solid-state NMR approaches to study the mechanically oriented complexes, and 3) solid-state NMR Magic Angle Spinning techniques to study membrane protein complexes in synthetic lipid bilayers. The latter two techniques will be developed at the National High Magnetic Field Laboratory. Since protein-protein complexes between membrane proteins play a central role in signal transduction mechanisms, the new technologies developed by the applicant upon completion of the K02 award are expected to not only characterize protein complexes involved in calcium regulation in muscle, but to be applicable to the cellular processes of homologous systems as well.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Scientist Development Award - Research (K02)
Project #
5K02HL080081-03
Application #
7231698
Study Section
Special Emphasis Panel (ZHL1-CSR-M (F2))
Program Officer
Scott, Jane
Project Start
2005-06-01
Project End
2010-05-31
Budget Start
2007-06-01
Budget End
2008-05-31
Support Year
3
Fiscal Year
2007
Total Cost
$107,892
Indirect Cost
Name
University of Minnesota Twin Cities
Department
Chemistry
Type
Schools of Arts and Sciences
DUNS #
555917996
City
Minneapolis
State
MN
Country
United States
Zip Code
55455
Ha, Kim N; Masterson, Larry R; Hou, Zhanjia et al. (2011) Lethal Arg9Cys phospholamban mutation hinders Ca2+-ATPase regulation and phosphorylation by protein kinase A. Proc Natl Acad Sci U S A 108:2735-40
Shi, Lei; Traaseth, Nathaniel J; Verardi, Raffaello et al. (2011) Paramagnetic-based NMR restraints lift residual dipolar coupling degeneracy in multidomain detergent-solubilized membrane proteins. J Am Chem Soc 133:2232-41
Verardi, Raffaello; Shi, Lei; Traaseth, Nathaniel J et al. (2011) Structural topology of phospholamban pentamer in lipid bilayers by a hybrid solution and solid-state NMR method. Proc Natl Acad Sci U S A 108:9101-6
Gaffarogullari, Ece C; Masterson, Larry R; Metcalfe, Emily E et al. (2011) A myristoyl/phosphoserine switch controls cAMP-dependent protein kinase association to membranes. J Mol Biol 411:823-36
Masterson, Larry R; Shi, Lei; Metcalfe, Emily et al. (2011) Dynamically committed, uncommitted, and quenched states encoded in protein kinase A revealed by NMR spectroscopy. Proc Natl Acad Sci U S A 108:6969-74
Gopinath, T; Verardi, Raffaello; Traaseth, Nathaniel J et al. (2010) Sensitivity enhancement of separated local field experiments: application to membrane proteins. J Phys Chem B 114:5089-95
Masterson, Larry R; Cheng, Cecilia; Yu, Tao et al. (2010) Dynamics connect substrate recognition to catalysis in protein kinase A. Nat Chem Biol 6:821-8
Traaseth, Nathaniel J; Gopinath, T; Veglia, Gianluigi (2010) On the performance of spin diffusion NMR techniques in oriented solids: prospects for resonance assignments and distance measurements from separated local field experiments. J Phys Chem B 114:13872-80
Mangia, Silvia; Traaseth, Nathaniel J; Veglia, Gianluigi et al. (2010) Probing slow protein dynamics by adiabatic R(1rho) and R(2rho) NMR experiments. J Am Chem Soc 132:9979-81
Gopinath, T; Veglia, Gianluigi (2010) Improved Resolution in Dipolar NMR Spectra Using Constant Time Evolution PISEMA Experiment. Chem Phys Lett 494:104-110

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